Artificial tooth.



"F. Z. HANsGoM.

ARTIFICIAL TOOTH.

APPLICATION FILED JAN. 31, 1910.

976,798, 4 Patented N0v.22,191o.

' l vm lmaon I '@MMM WM A To all whom it may concern:

UNITED STATES PATENT OFFICE. I mism' a Hamm, m9m

I 'I eliminieren roorn`.

refinance nov. 1910..

Application ed January 31, 1910. Serial No. 540,353.

Be it known that I, FRANK Z. HANSCQM, a

` citizen of the 'United States, residin at Chicago, county of Cook, and State of "ll'1.

nois, have inventedcertain new and useful `Improvements in Artificial Teeth, of which the following is a specification.

This invention relates toteetli formed lof porcelain or other suitable material, and to means for holding the same either in connection with crown-work or bridgework.

It is particularly applicable to lposterior teeth and provides, among other things, a

.novel method of supporting said teeth at, the ,cervical ends.

Among the ob'eets of the present inven tion are to provi eteeth constructed in such form that a relatively large body of porcelain or other suitable materialmay be used for each tooth, without being unctured or divided in order to support tie same and without having pins or posts inserted therein. By having a relatively large body of porcelain in each tooth, and properly pro portioning the same, ,the teeth are given greater strength and resistance; an by means of my novel form of support, the teeth are given a large base lto withstand the longitudinal thrust and are securely held in position, while at the same time they mafy be readily removed and replaced in case o accident.

ll have illustrated my invention in the accompanying drawings embodying differentforms thereof, in which- Figure 1 is a sectional view showing a root provided with a crown vand support em bodyin this invention; Fig. 2 is a sectional View ta (en at right angles to Fig. 1; Fig. 3 is a top plan view of the coping or metallic supporting portion shown in Fig. 1; Fig. 4 is a side view of the tooth or crown removed vfrom its support; Fig-5 is a sectional view showing the arrangement when used for bridge-work.

As shown in these drawings, 8 indicates the root of a tooth which is provided with a metallic coping or caplike member 9, this member havmgla substantially horizontal late or web l'tand a depending flange or and 11 engagil tg closely with the top of the root. In or r to further secure the coping in position, i may also be provided with a pin or post 12 extending centrally down into the root and firmly cemented therein. `When used for posterior'teeth, I prefer tc .the lower curved and undercut extends around the buccal side o the tooth,

have the web or plate 10- itch downwardly somewhat from the lin al side of the` tooth toward thebuccal vsi e. Aroundv thcperilphery of the plate 10, on the buccal side o the. tooth and extending nearlyaroundl to the lingual side, is an upwardly extending.

band 13, preferably undercut or recessed on its inner side as indicated' in Fi L to 3,V inclusive. This band is also pre erably of' uniform width but may be beveled, or tapered in a vertical direction. The' tooth or crown 14 is made with its upper portion' conforming to the particular tooth which it is adapted to replace,- and'withits lower portion curved and undercut so that it may e pressed into close contact with the plete 10 and the upwardly extending band 13 of l the coping, and when pressed into position, will be securely held b said plate and band, cement or other suitab e material bein used yto assist in holding the crown or tooth in osition. It will be particularly noted t at ortion 15 and in fact, around as far as the band 13 extends,- withl a shoulder 16 restingon the upper'edge of the band 13, so that the outer surface of the* crown is substantially 'flush with the outer surface of the locking band 13. On account ofthe depression of the plate 10 toward the bucca-l or outen'side of the tooth, it,permits the crown 14 vto be made exceedingly strong and substantial on that side of the tooth, and the shoulder 16 further assists in 'supporting and protecting such crown ortooth. It' will be readily seen that not only does this form of copine' or support, when combined with my novel orm of tooth, provide a rigid, strong and substantial artificial member, but it provides an arrangement whereby the coping may be first placed in position `and then the tooth or crown 4readily inserted. Furthermore, the tendency when the tooth is in normal use is to' force the crown more securely into its at;A

seat or support, rather than to loosen the saine. And it will alsobe observed that in case the tooth or crown portion 14 becomes broken, or for any reason it is desired to re place the same, it may be readily removed and ,a new crown inserted in its y place. When used for bridgefwork the supports or sockets are joined together by means of sol-v derin brazing, or in any suitable manner, and t e material usedffor this purpose may be flowed or spread along the bottoms of the plates or .socketsas indicated at 17, Fig. 5, in which case it forms additional backing or reinforcement for the supporting niembers or sockets.

Having thus described my invention, what 'I claim and desire to secure by Letters Patent is:

l. An artificial tooth having its cervical end undercut around a portion of the pe-y riphery thereof, such undercut portion tapering or receding from the outer or bue-cal s idei of the tooth towardI the lingual side thereof.

2. The combination of a coping having an undercut, upwardly extending ange extending partially around {the periphery thereof, such flange receding or taperingV from one side of the'coping toward thefother side, and a rtooth having an undercut ortion adapted to engagewith the plate an ange of said coping.

3. The combinationl with a support or coping having an undercut flange, said flange being tapered or receding from one side of the coping toward the other side thereof, and a tooth having its end undercut to engage With .said coping and flange, the shoulder formed by the undercutting of the tooth, resting upon the upper edge ot' said ange.

FRANK Z. HANSCOM. Witnesses:

A. W. FENSTEMAKER,

J.,SPENCER. 

